Next swc publish flow

[padmaia]

This PR sets up next-swc for publishing. Each binary will get published as its own npm package and will be listed as an optionalDependency so npm/yarn/pnpm will take care of downloading the correct one. These packages cannot live under the packages directory as it breaks yarn install, so they are kept at packages/next/build/swc/npm and are moved and versioned right before publishing. This is currently only building the 4 main targets, planning to build the rest in a follow up.

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
buildDuration	15.3s	15.2s	-40ms
buildDurationCached	3.5s	3.4s	-78ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +20 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.739	2.66	-0.08
/ avg req/sec	912.69	939.87	+27.18
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.488	1.554	⚠️ +0.07
/error-in-render avg req/sec	1679.85	1608.82	⚠️ -71.03

Client Bundles (main, webpack, commons)

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.1 kB	23.1 kB	✓
webpack-HASH.js gzip	1.5 kB	1.5 kB	✓
Overall change	67 kB	67 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
_app-HASH.js gzip	980 B	980 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.52 kB	2.52 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	904 B	904 B	✓
image-HASH.js gzip	4.13 kB	4.13 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	319 B	319 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	12.8 kB	12.8 kB	✓

Client Build Manifests

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
_buildManifest.js gzip	491 B	491 B	✓
Overall change	491 B	491 B	✓

Rendered Page Sizes

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	523 B	523 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
buildDuration	12.7s	12.6s	-127ms
buildDurationCached	5s	4.9s	-93ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +20 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.731	2.768	⚠️ +0.04
/ avg req/sec	915.46	903.3	⚠️ -12.16
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.512	1.564	⚠️ +0.05
/error-in-render avg req/sec	1653.15	1598.1	⚠️ -55.05

Client Bundles (main, webpack, commons)

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
17.HASH.js gzip	185 B	185 B	✓
677f882d2ed8..HASH.js gzip	14 kB	14 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	10.6 kB	10.6 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	67.9 kB	67.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
_app-HASH.js gzip	965 B	965 B	✓
_error-HASH.js gzip	3.71 kB	3.71 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.71 kB	2.71 kB	✓
head-HASH.js gzip	2.97 kB	2.97 kB	✓
hooks-HASH.js gzip	911 B	911 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	2.95 kB	2.95 kB	✓
withRouter-HASH.js gzip	294 B	294 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	17.7 kB	17.7 kB	✓

Client Build Manifests

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
_buildManifest.js gzip	498 B	498 B	✓
Overall change	498 B	498 B	✓

Rendered Page Sizes

	vercel/next.js canary	padmaia/next.js next-swc-publish-flow	Change
index.html gzip	577 B	577 B	✓
link.html gzip	589 B	589 B	✓
withRouter.html gzip	570 B	570 B	✓
Overall change	1.74 kB	1.74 kB	✓

Commit: bee8fbf